The Great Hangup Super Strong Window Hook for Bird Feeders Is a good hanger. Soak the suction cups in water for 2 minutes. Hangs strong! So far this is holding up on my kitchen window with a hummingbird feeder filled with nectar. I did clean the window with alcohol and then added a little water on the suction cups before pressing them against the window and this creates a good suction. I wait a little bit before initially hanging the full hummingbird feeder to allow the moisture to evaporate and create a good suction.